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striderjebby

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striderjebby

colour the building

there is a 10 storey building.you can colour it only by pink or green.but no two adjacent storeys can be pink.what is the total number of colouring the stories??
01:41 Fri 22nd Jul 20113 answers, last by boxtops 21:28 Fri 22nd Jul 2011

Only 1 question